They are not aggressive and flee when pursued. One of their common defenses is playing dead. The frightened animal rolls over, becomes limp, and shuts its eyes, coming back to life at the first opportunity to escape
If you come across an opossum on your property or on hikes, leave it alone. It will go away when you vacate the area. If it appears sick and remains in your area for several hours, notify the Los Angeles County Department of Animal Care & Control
at (626) 962-3577.